Rotifers are among the smallest animals on the planet and are abundant in freshwater plankton. They love to feed on algae and by grazing abundantly on them, they impact the amount of food available to other zooplankton such as small crustaceans like Copepods and Daphnia. Thus, they play an indirect role in zooplankton population control! On the other hand, Keratella can often be killed by getting stuck in the branchial chamber of Daphnia. Although, Keratella is one fast boi and can increase its swimming speed about 3.5 times to escape the filtering current of Daphnia!